/Engine/Source/Editor/Kismet/Classes/BlueprintPaletteFavorites.h
Adds the specified action to the current favorites list (fails if the action action can't be favorited, or if the favorite already exists). Will also convert the user's profile to a custom one (if it isn't already).
void AddFavorite ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FEdGraphSchemaAction](API\Runtime\Engine\EdGraph\FEdGraphSchemaAction) > PaletteAction )